Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b54584cddefcc6…

MALICIOUS

PDF

77.0 KB Created: 2021-03-18 06:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8bdac06a07fcdeb37f84d5972f8e3dd6 SHA-1: 8974cf1168348b317f3fa980365a3958d2c5752f SHA-256: d5b54584cddefcc62bd4d6901e9f2740c173eaf04693ce7ff690350cefb84fb2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=manual+air+mattress+pump PDF link annotation
    • https://cdn.sqhk.co/zopisipiwele/iyhiEge/science_et_vie_photographie.pdfIn PDF document text
    • http://mimedilubaj.22web.org/the_pioneers_of_african_literature_in_european_languages.pdfIn PDF document text
    • https://cdn.sqhk.co/davufedojuja/jbgcoif/cassandra_for_ubuntu_16._04.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/b9fbf4ea69d.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/LIibjdB/all_army_prt_drills.pdfIn PDF document text
    • https://zobovakobazazu.weebly.com/uploads/1/3/4/3/134319401/zebavularub.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/dtjaEf5/34526561581.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/WJhjjgP/supotapozimesutik.pdfIn PDF document text
    • http://bujufamamaw.22web.org/blackberry_torch_9800_os_7._1.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/d472a92bf72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e06782-abc8-4fe9-adc3-226825b66f47/data_structures_and_algorithm_analysis_in_c_by_mark_allen_weiss_ppt.pdfIn PDF document text
    • http://jababonulet.epizy.com/31673559226.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/bituthene_primer_s2_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffee786-1e6d-423e-bea9-852676417942/how_to_get_password_for_hp_deskjet_2544.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/47287113261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa93bd83-8755-41c8-a67b-dc1a294e1c0e/how_to_factory_reset_a_nexus_7_tablet.pdfIn PDF document text
    • http://gamadajizi.rf.gd/soleus_air_portable_air_conditioner_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc86d233-9de2-4652-9405-996d0a03d1de/52986247266.pdfIn PDF document text
    • http://lenomona.rf.gd/how_much_is_a_gym_membership_at_lifetime_fitness.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 4972 bytes
SHA-256: acfaa93bf597d8867ef7688a1a8bdd61e85877954b189b52579bbf86749927d8
font_01_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 11164 bytes
SHA-256: 707caef1599b0c92e530e3d46763135ec0f470e021e72aac102e56153e7163cd

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